<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title></title>
	<style type="text/css">

		*{
			padding: 0;
			margin: 0;
		}
		div{
			width: 300px;
			height: 300px;
			border: 1px solid red;
			background-color: green;
			/*margin: 20px;*/

			margin-top: 30px;
			margin-left: 50px;
			margin-bottom: 100px;

		}
		p{
			border: 1px solid green;
		}


	</style>
</head>
<body>

	<!-- margin: 外边距  指的是距离

	
	 -->
	<div></div>

	<p>我是一个p标签</p>
	
</body>
</html>
